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Alkaline Earth Metals: Anomalous Properties And Compounds

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Alkaline Earth Metals: Anomalous Properties And Compounds - Lesson Summary

Beryllium exhibits some anomalous behaviour and has a diagonal relationship with aluminium due to their similar charge/radius ratios.

The hydroxides of both the metals dissolve in solutions of excess hydroxide to form complex ions.
Beryllium oxide and Beryllium hydroxides are amphoteric substances, they can act as acids and as bases. 

Calcium oxide (CaO) commonly known as quicklime is formed from the decomposition of calcium carbonate.

CaCO 3  ∆ →   CaO + CO 2

Calcium oxide is a basic oxide and thus combines with acidic oxides at high temperature. Calcium oxide has a number of industrial uses.  It is necessary for the manufacture of cement and is the cheapest form of alkali.  It is used to produce sodium carbonate from sodium hydroxide. It is used in the purification of sugar and in the manufacture of various dyes.

Slaked lime (or) calcium hydroxide [Ca(OH) 2] is sparingly soluble in water.  Limewater a suspension of calcium hydroxide can be used to test for the presence of carbon dioxide.It is used in the preparation of mortar and to make white wash.  It is necessary for making glass as well as for the tanning of leather.

Calcium carbonate (CaCO 3) is nearly insoluble in water and occurs naturally as limestone, marble and chalk.Calcium carbonate is used for a variety of purposes. It is well-known as a building material. It is necessary in the manufacture of quicklime. It is used industrially as a flux in extracting metals from ores and the manufacture of high quality paper. Calcium carbonate is an ingredient in toothpaste and chewing gum, and is used as filler in cosmetics.

Plaster of Paris is a hemihydrate of calcium sulphate. Plaster of Paris is formed when gypsum or Calcium sulphate dihydrate is heated to 393K. 

The main components of cement are calcium oxide and silicon dioxide. Cement is used to make concrete and reinforced concrete. It is used in plastering, as well. It is best known for its use in the construction of bridges, dams and buildings of all sorts

Magnesium is found in chlorophyll and as cofactors in certain enzymes.

Calcium is important in bone structure, muscle contraction and other biological processes. 


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